CommentStreams:11e8ae6c4c76e6356e45a1e779a977bd

small refactoring of fan-rpi.py

1. !/usr/bin/python3

1. DON'T use pigpiod library on Nov. 24 2022 by Harry Huang
2. import pigpio

import RPi.GPIO as IO import time import subprocess import logging

servo = 18 logging.basicConfig(format='%(message)s', level=logging.DEBUG) IO.setwarnings(False) IO.setmode (IO.BCM) IO.setup(servo,IO.OUT) fan = IO.PWM(servo,2000) fan.start(0)

def get_temp():

   output = subprocess.run(['cat', '/sys/class/thermal/thermal_zone0/temp'], capture_output=True)
   temp_str = output.stdout.decode()
   try:
       return float(temp_str)/1000
   except (IndexError, ValueError):
       raise RuntimeError('Could not get temperature')

while 1:

   temp = get_temp()                        # Get the current CPU temperature
   if temp > 60:                            # Check temperature threshhold, in degrees celcius
       fan.ChangeDutyCycle(100)             # Set fan duty based on temperature, 100 is max speed and 0 is min speed or off.
       logging.debug("Temp: %d, speed: 100", temp)
   elif temp > 50:
       fan.ChangeDutyCycle(90)
       logging.debug("Temp: %d, speed: 90", temp)
   elif temp > 40:
       fan.ChangeDutyCycle(85)
       logging.debug("Temp: %d, speed: 85", temp)
   elif temp > 32:
       fan.ChangeDutyCycle(70)
       logging.debug("Temp: %d, speed: 70", temp)
   elif temp > 25:
       fan.ChangeDutyCycle(60)
       logging.debug("Temp: %d, speed: 60", temp)
   else:
       fan.ChangeDutyCycle(0)
       logging.debug("Temp: %d, speed: 0", temp)
   time.sleep(5)                            # Sleep for 5 seconds